Shoe repairing machine



N. JAFFE May 21, 1940.

SHOE REPAIRING MACHINE Filed March 15, 1939 HT -WV/AEI HAAAAAW gwwm Naifian J/ fe I Patented May 21, 1940 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to shoe repairing machines, and more particularly to an attachment for use with a repair machine for grooving or roughing one side of a piece of leather, such as a shoe sole in order to provide a sufficiently rough surface so that two pieces of leather may be firmly and adhesively secured together.

An object of this invention is to provide a leather grooving means which may be detachably secured to the present parts of a shoe repair machine, the grooving means taking place of the steel brush at present provided on the repair machine.

Another object of this invention is to provide a plurality of roughing blades of substantially star-shape and means for securing the blades in face abutting relation so as to hold the blades against rotation relative to each other.

A further object of this invention is to provide a stem or handle and blades detachably mounted on the stem or handle, the blades being provided with interen'gaging means so as to hold the blades against rotation relative to each other.

A further object of this invention is to provide a blade means for forming parallel grooves in the surface of a piece of leather, the blade means being provided with keen edges parallel with the opposite faces of the blades so that only a relatively small amount of material will be cut out of the surface of the leather to provide a base for an adhesive to firmly secure the leather on another piece of leather or other suitable surface.

To the foregoing objects and to others which may hereinafterappear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying invention, wherein is shown an embodiment of this invention, but it is to be understood that changes, variations and modifications may be re-- sorted to which fall within the scope of the invention as claimed.

In the drawing:

Figure 1 is a detail side elevation partly in lon- 4,5v gitudinal section of a grooving means constructed according to an embodiment of this invention,

Figure 2 is a vertical section of one of the grooving blades,

. Figure 3 is a sectional view taken on the line 33 of Figure 1,

Figure 4 is a vertical section of a modified form of blade, and

Figure 5 is a detail front elevation of a blade shown in Figure 4.

Referring to the drawing, and first to Figure 1, the numeral [0 designates generally a grooving blade comprisinga disc-like body member or plate H provided with an axial opening l3. The outer edge of the body member or plate II has formed integral therewith a series of closely related radially disposed frusto tapered arms 12 each having its outer end terminal portion oppositely inwardly beveled on its opposite faces to an extent to form a sharp outer end edge portion M which is disposed in a line extending between,

parallel to and spaced from the opposite faces 7 of the said arm [2. The edge portions I4 are of arcuate contour and arranged in a circular row disposed coaxially with the opening I3. The said oppositely beveled end terminal portions are of V-form. An edge portion 14, in connection with the oppositely inwardly beveled end terminal portion with which it is correlated will provide a substantially V-shaped groove in the surface of the leather when the blade acts on the latter, and as the said keen edge portions [4 of the blade may be caused to successively act on the leather, the V-groove can be made continuous and of any desired length. The body member or plate I! is provided with a relatively small opening i5 outwardly of the central opening l3 and when a number of these blades H] are disposed in face abutting relation as shown in Figure l, a locking pin I6 is adapted to extend through aligned openings I5 so as to thereby hold the blades against rotation relative to each other. The central opening I3 is provided for the passage of a mount for the blade.

If desired, the grooving blades I0 may be mounted on a stud I! which is carried by a driven shaft Hi. This shaft I8 is provided at one end thereof with a threaded recess or socket I9 within which the projecting end of a rotatable driving spindle 20 therefor is adapted to engage. At the present time the spindle 20 has an edging blade 2! secured thereto and forms a part of the present structure of the repair machine.

The shaft I8 is provided with an annular flange 22 at the inner end of the stud I1 and against which the innermost of the blade members It] is adapted to abut. The stud I1 is provided with a threaded opening 23 in which a headed screw or bolt 24 is adapted to engage. A washer 25 is interposed between the head of the screw or bolt 24 and the outermost 0f the blades l0 so as to frictionally hold the blades l0 against rotation relative to the stud H.

In Figure 4 there is disclosed a modified form of blade structure wherein a blade member Ill is disclosed, the blade ill including a disc-like the body member or plate H having integral with its outer edge a series of closely related radially disposed frusto-tapered arms l2, each having its outer end terminal portion oppositely inwardly beveled on its opposite faces to an extent to form a sharp outer end edge portion I4 which is disposed in a line extending between, parallel to and spaced from opposite faces of the arm 52. The edge portions it are arranged in a circular row disposed coaxially with an axially arranged opening 13 in the body member II. The latter is formed of a pair of semi-circular portions 26, 2'! disposed in oifset relation and forming shoulders 28, 29 on opposite sides of the body member Il at the horizontally diametric center of the latter.

In the present instance, the oifset portions or shoulders 38 and 29 are substantially positioned through the diameter of the blade it so that a nmnber of these blade members may be disposed in face abutting relation with the offset portions of one blade interlocking or interengaging with the offset portions of an adjacent blade so as to thereby hold the blades against rotation relative to each other. The blade member W may be formed by stamping the blade from a sheet of metal and as many of these blade members itl may be disposed in face abutting relation as are considered necessary or desirable for the shoe sole grooving operation. The blade member ill" may be mounted on the present shaft or spindle with the shoe edging blade at present forming part of the repair machine, or if desired, the blades 5 El may be mounted on a handle similar to andle or extension l8 and then mounted on the heel trimming shaft now forming a part of the shoe repair machine.

In the use and operation of this blade structure as many of the blades l!) or til are disposed in face abutting relation as are considered necessary or up to the capacity of the spindle or shaft they are mounted on and at the time of the mounting thereof, the pin it is mounted in the aligned pin openings it. The washer or plate 25 is of such a diameter as to engage against one end of the pin it, and the flange 22 has a sufficient diameter so that the opposite end of the pin i6 will engage thereagainst. In this manner the pin !8 will not fall out or work out of the pin openings 55 during the use of the grooving device. The shoe sole is placed against the blade members i 0 or it and moved therealong, so that a plurality of relatively shallow grooves of substantially V-shaped construction are provided in the surface of the leather.

With a shoe sole grooving device as hereinbefore described, the blades will not become clogged with the fibers as is the case with the steel brush at present in use. The rotation of the nested blades will also act as a means to blow out the loosened fibers which are then picked up by the suction device forming part of the repair machine.

These blade members when they become dull may be readily sharpened so that these blades will last for a considerably longer period of time than a steel brush and the blades may also be used more strenuously than a steel brush without affecting the structure of the blades. Where a steel brush is used extreme pressure on the brush will cause the strands of the brush to bend and in this manner the efficiency of the brush is reduced. In addition to this, the outer ends of the strands forming the brush soon become rounded off and the efficiency of the steel brush is impaired, requiring the replacement of the brush whereas with a roughing device formed of blades as hereinbefore described when the blades become dull they may be readily sharpened through the use of a file or other abrasive means which will reestablish keen edges l4.

What I claim is:

i. In a leather grooving means, a bodily revoluble roup of abutting stationary blades, each including a disc-like axially apertured body portion having integral with its outer edge a series of closely re ted radially disposed frusto-tapcrcd arms of like form each having its outer end terminal portion oppositely inwardly beveled to form it with a sharp outer curved cutting edge portion disposed on a line extending between and spaced from opposite faces of the arm with which the edge portion is correlated, the said oppositely inwardly beveled end terminal portion being of i-forin, the apertures of said body portions providing for the mounting of the group on a revolving means for the latter, and said blades having correlated inherent means to prevent the shifting of one blade of the group relative to an adjacent blade on the revolving of the group.

2. In a leather grooving means, a bodily revoluble group of abutting stationary blades, each including a disc-like axially apertured body portion having integral with its outer edge a series of closely related radially disposed frusto-tapered arms 01 like form each having its outer end terminal portion oppositely inwardly beveled to form it with a sharp outer curved cutting edge portion disposed on a line extending between and spaced from opposite faces of the arm with which the edge portion is correlated, the said oppositely inwardly beveled end terminal portion being of v-form, the apertures of said body portions providing for the mounting of the group on a revolving means for the latter, and the body portion of each blade being formed of a pair of parts isposed in offset relation with respect to the other, the said offset parts of said body portions being so correlated to prevent the revolving of one blade relative to an adjacent blade on the revolving of said group.

3. In a leather grooving means a blade including a disc-like axially apertured body portion havin integral with its outer edge a series of closely related radially disposed frusto-tapered arms of like form each having its outer end terminal portion oppositely beveled to provide it with a sharp outer cutting edge portion disposed on a line extending between and spaced from opposite faces of the arm, said body portion being formed of a pair of semi-circular parts disposed in offset relation.

NATHAN JAFFE.

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